UTI vs. Kidney Infection: How to Tell the Difference (And When to See a Doctor)

What is a UTI?

A urinary tract infection (UTI) is a bacterial infection anywhere in the urinary tract — most commonly in the bladder (cystitis). UTIs are one of the most common infections in adults, affecting about 50–60% of women at some point in their lives.

Classic symptoms of a bladder UTI include:

• Burning or pain with urination (dysuria)
• Frequent urge to urinate, even when little comes out
• Cloudy or foul-smelling urine
• Pelvic discomfort or pressure
• Possibly blood in the urine

Importantly, a simple bladder UTI typically does not cause fever, chills, or back pain.

What is a kidney infection (pyelonephritis)?

A kidney infection happens when bacteria travel from the bladder up to one or both kidneys. This is a more serious infection that requires prompt treatment — usually with stronger antibiotics and sometimes IV treatment in a hospital.

Symptoms that suggest a kidney infection (rather than just a bladder UTI):

• Flank pain — pain in your side and back, below the ribs
• Fever and chills (temperature above 100.4°F/38°C)
• Nausea or vomiting
• General feeling of being very unwell
• Plus the UTI symptoms above

Can a telehealth visit treat my UTI?

Yes — for most uncomplicated bladder UTIs, a virtual visit is entirely appropriate. Li Health will take your history, ask about your symptoms, and if a UTI is the likely diagnosis, prescribe an antibiotic sent directly to your pharmacy.

For suspected kidney infections, Li Health will evaluate the severity. Mild kidney infections can sometimes be treated with oral antibiotics, but more severe cases warrant in-person evaluation and sometimes IV antibiotics.